Groove geometry definitions

Groove geometry definitions

Summary

ESDU 75028 is derived
from a correlation of experimental data that enable the drag increment to be predicted due to a groove of planform
aspect ratio greater than 8 normal to the flow. For grooves inclined at angles to the flow exceeding 60 degrees the
data for the grooves normal to the flow apply, while for grooves inclined between 0 degrees (parallel to the flow)
and 60 degrees a method for obtaining the maximum increment is suggested based on the use of
ESDU 75031 to predict
the increments due to the forward- and rearward-facing steps together with an appropriate skin friction allowance.